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https://issues.apache.org/jira/browse/IGNITE-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov resolved IGNITE-1548.
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Resolution: Won't Fix
> Optimize portable object header.
> --------------------------------
>
> Key: IGNITE-1548
> URL: https://issues.apache.org/jira/browse/IGNITE-1548
> Project: Ignite
> Issue Type: Task
> Components: general
> Affects Versions: 1.1.4
> Reporter: Vladimir Ozerov
> Assignee: Vladimir Ozerov
> Priority: Blocker
> Fix For: 1.5
>
>
> Currently portable object header takes 18 bytes:
> 1 - object type
> 1 - user flag
> 4 - type ID
> 4 - hash code
> 4 - length
> 4 - raw offset.
> The following optimizations can be applied:
> 1) User flag can be easilty merged into object type. (-1 byte)
> 2) In most cases only length or raw-offset exists, but not both. Remove one
> of them and encode state into the object type. (-4 bytes)
> 3) Length usually fit in 1-2 bytes. Encode it with "variable bytes" algo
> (-2-3 bytes).
> As a result we will shrink header size from 18 to 10-11 bytes. Encoded states
> will require 6 additional object types:
> 104 => system, with length
> 105 => system, with raw offset
> 106 => system, with both
> 107, 108, 109 - the same, but for user types.
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